song_task.c

单片机开发程序原码,仅供个人学习参考. 各原码详细功能见压缩包及代码注释.

/*C**************************************************************************
* NAME:         song_task.c
*----------------------------------------------------------------------------
* Copyright (c) 2003 Atmel.
*----------------------------------------------------------------------------
* RELEASE:      snd1c-refd-nf-4_0_3      
* REVISION:     1.16     
*----------------------------------------------------------------------------
* PURPOSE:          
* This file contains the song task and attached routines
*
* CONFIGURATION
* Three #define must be set in config.h:
*   - PLAYER_PLAY_MODE
*       PLAY_DIR      play selected dir
*       PLAY_DISK     play whole disk including sub-directory
*   - PLAYER_PLAY_START
*       START_PLAY    start playing after power-up
*       START_STOP    do not play after power-up
*   - PLAYER_PLAY_LOOP
*       PLAY_LOOP     loop after last file of dir or disk has been played
*       PLAY_NO_LOOP  no loop after last file of dir or disk has been played
* NOTES:
* Global Variables:
*   - gl_key_press:   bit in bdata space
*   - gl_key:         byte in idata space
*   - gl_mem_failure: bit in bdata space
*****************************************************************************/

/*_____ I N C L U D E S ____________________________________________________*/

#include "config.h"                         /* system configuration */
#include "lib_mcu\lcd\lcd_drv.h"  
#include "modules\file\file.h"              /* file definition */
#include "lib_mcu\clock\clock.h"            /* clock definition */
#include "lib_mcu\kbd\key_drv.h"
#include "lib_mcu\aud\aud_drv.h"            /* audio driver definition */
#include "lib_mcu\mp3\mp3_drv.h"            /* mp3 driver definition */
#include "song_drv.h"                       /* song driver definition */
#include "song_task.h"                      /* song task definition */ 

/*_____ M A C R O S ________________________________________________________*/


/*_____ D E F I N I T I O N ________________________________________________*/

extern  bdata   bit     gl_key_press;       /* TRUE when a key is decoded */
extern  idata   Byte    gl_key;             /* value of the key pressed */
extern  bdata   bit     gl_mem_failure;     /* memory hardware failure */

Byte    song_state;                         /* task state */
static  bit     song_loop;                  /* auto replay */
extern  Byte    mp3_volume;

/*_____ D E C L A R A T I O N ______________________________________________*/


/*F**************************************************************************
* NAME: song_task_init
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*   Song playing task initialization
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void song_task_init (void)
{
  song_loop = PLAYER_PLAY_LOOP;             /* default loop playing */
  song_snd_init();                          /* init sound control */
  song_state = SONG_START;
}


/*F**************************************************************************
* NAME: song_task
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*   Song playing task
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void song_task (void)
{
// Byte  cpt_data;
bit     loop;

  /*if (Mp3_frame_request())
  { 
   // printch(0x96,"请求  ");
    cpt_data = 0;
    do
    {
      Mp3_load(Fgetc());                     //send data while requested 
      cpt_data++;
      // workaround for 320Kbs frame support 
      if ((cpt_data & 0x40) == 0x40)
      {
        Mp3_set_full();
        Mp3_reset_full();                   // ack 64 Bytes write 
        break;
      }
    }
    while (Mp3_frame_request());           //  until frame request */

    while (Mp3_frame_request())             /* frame request ? */
    {
      Mp3_load(Fgetc());                    /* send data while requested */
    }
//}

  switch (song_state)
  {
    case SONG_START:
    { 
	  printch(0x93,"标准  ");
	  Mp3_set_right_vol(0);
      Mp3_set_left_vol(0);
      song_state = SONG_INSTALL;
      break;
    }


    case SONG_INSTALL:
    {
      if (File_entry_root(FILE_MP3 | FILE_DIR) == OK) /* goto root directory */
          {	
		    Mp3_set_right_vol(0);
            Mp3_set_left_vol(0);
            print_file_name();              /* display file name */
            //#if PLAYER_PLAY_START == START_STOP
            //  song_state = SONG_IDLE;
            //#else
              if (File_type() == FILE_DIR)
              { /* file_type is dir */
              #if PLAYER_PLAY_MODE == PLAY_DISK
                song_state = SONG_NEW;      /* enter dir and play */
              #else
                song_state = SONG_NEXT;     /* stay in root dir */
              #endif
              }
              else
              { /* file_type is MP3 */
                song_state = SONG_INIT;
              }
//            #endif
           }
          else
          { /* root is empty of song & diretory */
            song_state = SONG_NO_SONG;
          }

      break;
    }


    case SONG_IDLE:                         /* no file openned */
    { 
     printch(0x90,"挂起  ");
     
      if (gl_key_press)                     /* a key is pressed? */
      {
        switch (gl_key)
        {
          case KEY_PLAY:
            if (File_type() == FILE_DIR)
            {
              file_entry_dir(FILE_MP3 | FILE_DIR);  /* goto sub-directory */ 
              print_file_name();            /* display directory name */
            }
            else
            { /* file_type is MP3 */
              song_state = SONG_INIT;
            }
            break;

          case KEY_NEXT:
            file_seek_next(FILE_MP3 | FILE_DIR, TRUE);  /* select next song with loop */
            print_file_name();              /* display file name */
            break;

          case KEY_PREV:
            file_seek_prev(FILE_MP3 | FILE_DIR, TRUE);  /* select previous song */
            print_file_name();              /* display file name */
            break;

          case KEY_INC:
            song_snd_inc();                 /* increment selected control */
            print_sound_level();            /* display new level */
            break;

          case KEY_DEC:
            song_snd_dec();                 /* decrement selected control */
            print_sound_level();            /* display new level */
            break;

         // case KEY_SOUND:
         //   song_snd_select();              /* select next sound control */
         //   print_sound();                  /* display selected sound icon */
         //   print_sound_level();            /* display new level */
         //   break;

          case KEY_PARENT:
            File_goto_parent(FILE_MP3 | FILE_DIR); /* goto parent directory */ 
            print_file_name();              /* display first file name */
            break;

          default:
            break;
        }
        gl_key_press = FALSE;               /* ack key usage */
      }
      break;
    }


    case SONG_INIT:
    { 
    //  printch(0x90,"就绪  ");
    //  disp_clock_reset();                   /* reset clock timer */
      if (Fopen(READ) == OK)
      {
         //if (song_init() != SONG_NO_ERR)     /* init song playing */
         //{
          // song_stop();                      /* stop playing song */
          // Fclose();
         //  loop = song_loop;
         //  song_state = SONG_NEXT;
        // }
         //else
        {  
          song_audio_init();                /* init audio interface */
          clock_song_init();  
          song_state = SONG_PLL;

          Mp3_set_right_vol(mp3_volume);
          Mp3_set_left_vol(mp3_volume);
        }
      }
      else
      {
        song_state = SONG_ERROR;
      }
      break;
    }


    case SONG_PLL:
    { 
      if (Pll_get_lock())                   /* pll locked? */
      {
        song_start();                       /* start playing song */
        //disp_clock_start();                 /* start clock timer */
        print_state_play();                 /* display play icon */
        song_state = SONG_PLAY;
      }
      break;
    }

    case SONG_PLAY:
    {
     // printch(0x94,"播放  ");
      if (Feof() == TRUE)
      { 
	    Mp3_set_right_vol(0);
        Mp3_set_left_vol(0);
	    //printch(0x90,"结束  ");/* end of file reached */
        song_stop();                        /* stop playing song */
        //Fclose();
        loop = song_loop;
        song_state = SONG_NEXT;
          gl_key_press = FALSE;             /* no key usage */
        }

      if (gl_key_press)                     /* a key is pressed? */	  	  	  	  	  	  	  	  	  	  	  	  
      {
	    gl_key_press = FALSE;
        switch (gl_key)
        {